Watch strap



FIG. 1 is a top plan view of a watch strap showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a bottom plan view;

FIG. 4 is a right side elevational view;

FIG. 5 is a rear end elevational view; and

FIG. 6 is a front end elevational view. 

The ornamental design for a watch strap, as shown and described. 